- 2027 Factory-verified
Pro: S; AT4, Elevation, AT4X, Denali, Denali Ultimate: not offered
QK1 Factory-verified
Also documented for Chevrolet
Documented applications
- 2025–2027 Factory-verified
only in: 2500 HD and 3500 HD pickup
- 2019–2020, 2022–2026 Factory-verified
the upfitter lists read "Gate type, pickup box end, standard"
This page aggregates every documented appearance of QK1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.